13.1/64 and ASuS X5DC (Sis 671/771 PCiE) laptop having only 640x480 (Native is 1366x768 in Win)

Have some trouble getting proper resolutions out of this, it’s reallt a 1366x768 display panel.

-:~> xrandr 

xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 640 x 480, maximum 640 x 480
default connected 640x480+0+0 0mm x 0mm
   640x480        73.0*



-:~> /sbin/lspci -nnk

00:00.0 Host bridge [0600]: Silicon Integrated Systems [SiS] 671MX [1039:0671]
    Subsystem: ASUSTeK Computer Inc. Device [1043:1cf7]
    Kernel driver in use: agpgart-sis
00:01.0 PCI bridge [0604]: Silicon Integrated Systems [SiS] AGP Port (virtual PCI-to-PCI bridge) [1039:0003]
    Kernel modules: shpchp
00:02.0 ISA bridge [0601]: Silicon Integrated Systems [SiS] SiS968 [MuTIOL Media IO] [1039:0968] (rev 01)
00:02.5 IDE interface [0101]: Silicon Integrated Systems [SiS] 5513 IDE Controller [1039:5513] (rev 01)
    Subsystem: ASUSTeK Computer Inc. Device [1043:1cf7]
    Kernel driver in use: pata_sis
    Kernel modules: pata_sis, pata_acpi, ata_generic
00:03.0 USB controller [0c03]: Silicon Integrated Systems [SiS] USB 1.1 Controller [1039:7001] (rev 0f)
    Subsystem: ASUSTeK Computer Inc. Device [1043:1cf7]
    Kernel driver in use: ohci-pci
    Kernel modules: ohci_pci
00:03.1 USB controller [0c03]: Silicon Integrated Systems [SiS] USB 1.1 Controller [1039:7001] (rev 0f)
    Subsystem: ASUSTeK Computer Inc. Device [1043:1cf7]
    Kernel driver in use: ohci-pci
    Kernel modules: ohci_pci
00:03.3 USB controller [0c03]: Silicon Integrated Systems [SiS] USB 2.0 Controller [1039:7002]
    Subsystem: ASUSTeK Computer Inc. Device [1043:1cf7]
    Kernel driver in use: ehci-pci
00:05.0 IDE interface [0101]: Silicon Integrated Systems [SiS] SATA Controller / IDE mode [1039:1183] (rev 03)
    Subsystem: ASUSTeK Computer Inc. Device [1043:1cf7]
    Kernel driver in use: sata_sis
    Kernel modules: sata_sis, pata_acpi, ata_generic
00:06.0 PCI bridge [0604]: Silicon Integrated Systems [SiS] PCI-to-PCI bridge [1039:000a]
    Kernel driver in use: pcieport
    Kernel modules: shpchp
00:07.0 PCI bridge [0604]: Silicon Integrated Systems [SiS] PCI-to-PCI bridge [1039:000a]
    Kernel driver in use: pcieport
    Kernel modules: shpchp
00:0f.0 Audio device [0403]: Silicon Integrated Systems [SiS] Azalia Audio Controller [1039:7502]
    Subsystem: ASUSTeK Computer Inc. Device [1043:16f3]
    Kernel driver in use: snd_hda_intel
    Kernel modules: snd_hda_intel
00:1f.0 PCI bridge [0604]: Silicon Integrated Systems [SiS] PCI-to-PCI bridge [1039:0004]
    Kernel driver in use: pcieport
    Kernel modules: shpchp
01:00.0 VGA compatible controller [0300]: Silicon Integrated Systems [SiS] 771/671 PCIE VGA Display Adapter [1039:6351] (rev 10)
    Subsystem: ASUSTeK Computer Inc. Device [1043:19e2]
02:00.0 Network controller [0280]: Qualcomm Atheros AR9285 Wireless Network Adapter (PCI-Express) [168c:002b] (rev 01)
    Subsystem: AzureWave AW-NE785 / AW-NE785H 802.11bgn Wireless Full or Half-size Mini PCIe Card [1a3b:1089]
    Kernel driver in use: ath9k
    Kernel modules: ath9k
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 01)
    Subsystem: Realtek Semiconductor Co., Ltd. RTL8111/8168 PCI Express Gigabit Ethernet controller [10ec:8168]
    Kernel driver in use: r8169
    Kernel modules: r8169

Heres Xorg.0.log
SUSE Paste

I says:

(EE) SIS(0): No valid modes found - check VertRefresh/HorizSync

So try to remove/rename /etc/X11/xorg.conf or change it.
The VertRefresh value seems to be set wrong.

The log also mentions:

(II) SIS(0): Monitor1: Using vrefresh range of 59.00-61.00 Hz
(II) SIS(0): Monitor1: Using vrefresh value of 71.00 Hz

This would of course explain why there are no valid modes found. 71Hz is outside the monitor’s apparently accepted range of 59-61Hz